I’ve been running an A770 Limited Edition on Arch for a year now and I am happy with it now. It was a rough start, with issues ranging from glitches and crashes to HDMI and DisplayPort audio/VRR issues, but these days it is pretty solid. VRR works fine on my DisplayPort 144Hz 4K monitor. Most games perform pretty well but temper your expectations, the A770 is a midrange card.
I can play Overwatch 2 at 4K 144Hz low settings just fine and I don’t see many frame dips. It’s not noticeable if it does dip because VRR. CS2 performance isn’t amazing, but at low settings 4K I get between 100 and 160 frames depending on complexity. I have FSR turned on. On Cyberpunk I have FSR turned on and it seems to dip down to 20fps when out in the desert and the city is in view, but usually 40 to 60.